importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.PreparedStatement;publicclassJDBC20BatchDemo{//定义MySQL的数据库驱动程序...

DELIMITER//DROPPROCEDUREmyproc//--删除过程CREATEPROCEDUREmyproc(INp1int,INOUTp2int,OUTp3int)BEGINSELECTp1,p2,p3;--输出p1、p2、p3的内容SETp1=10;SETp2=20;SETp3=30;END//DELIM...

importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.PreparedStatement;importjava.io.File;importjava.io.FileInputSt...

importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.PreparedStatement;importjava.text.SimpleDateFormat;publicclass...

importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.Statement;importjava.sql.ResultSet;publicclassResultSetDemo01{...

importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.Statement;publicclassDeleteDemo{//定义MySQL的数据库驱动程序publicstaticfinalStringDBDRIVER="org.gjt....

publicclassConnectionDemo01{//定义MySQL的数据库驱动程序publicstaticfinalStringDBDRIVER="org.gjt.mm.mysql.Driver";publicstaticvoidmain(Stringargs[]){try{Class.forName(DBDR...

DROPTABLEuser;--删除表CREATETABLEuser(idINTAUTO_INCREMENTPRIMARYKEY,nameVARCHAR(30)NOTNULL,passwordVARCHAR(32)NOTNULL,ageINTNOTNULL,sexVARCHAR(2)DEFAULT'男',birthda...

interfaceA{publicvoidprintInfo();//}classBimplementsA{//实现接口publicvoidprintInfo(){System.out.println("HelloWorld!!!");}};classX{publicvoidfun1(){this.fun2(newB(...

publicclassWrapperDemo01{publicstaticvoidmain(Stringargs[]){intx=30;//基本数据类型Integeri=newInteger(x);//装箱：将基本数据类型变为包装类inttemp=i.intValue();//拆箱：将一个包装类变为基本数据类型}};p...

classDemo{//定义Demo类，实际上就是继承了Object类};publicclassObjectDemo01{publicstaticvoidmain(Stringargs[]){Demod=newDemo();//实例化Demo对象System.out.println("不加toString()输出："+...

interfacePet{//定义宠物接口publicStringgetName();publicStringgetColor();publicintgetAge();}classCatimplementsPet{//猫是宠物，实现接口privateStringname;//宠物名字privateStringcolor...

abstractclassA{//定义抽象类Apublicabstractvoidprint();//定义抽象方法print()};classBextendsA{//定义子类，继承抽象类publicvoidprint(){//覆写抽象方法System.out.println("HelloWorld!!!");}};pu...

classA{//定义类Apublicvoidfun1(){//定义fun1()方法System.out.println("A-->publicvoidfun1(){}");}publicvoidfun2(){this.fun1();//调用fun1()方法}};classBextendsA{publicvoid...

classA{//定义类Apublicvoidfun1(){//定义fun1()方法System.out.println("A-->publicvoidfun1(){}");}publicvoidfun2(){this.fun1();//调用fun1()方法}};classBextendsA{publicvoid...